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14,448 startups · 29 programs

Party

Active · Secure multiplayer workspace for teams building with agents

WebsiteYC profile

Why it ranks

How the rank works
9signal of 100 · rising 4
  • team of 8Team size · YC's directory+4.9
  • went through YCProgram · this site+4

A sum of public facts, not a judgement and not investment advice.

Competitors

AIRoutineShared: collaboration, productivity, workspaceYC W21ParisStartup →Developer toolsInactiveClayShared: collaboration, productivity, happenYC W21RemoteStartup →AIKilvinShared: secure workspace, productivity, neededYC F24New York CityStartup →
Companies closest to Party
Company
RoutineShared: collaboration, productivity, workspaceYC W21ActiveAI
ClayShared: collaboration, productivity, happenYC W21InactiveDevtools
KilvinShared: secure workspace, productivity, neededYC F24ActiveAI, Data, Devtools

Adjacent

OtherMultiplyShared: workspaceAntler 2021SwedenStartup →OtherInactiveBlitzIQShared: collaboration, productivity, workspaceYC W19San FranciscoStartup →AIInactivePatchworkShared: collaboration, productivity, slackYC W24San FranciscoStartup →OtherAcquiredHackPadShared: collaboration, productivity, doneYC W12San FranciscoStartup →OtherAcquiredSphere Secure WorkspaceShared: secure workspaceYC S15LondonStartup →
Companies next to Party
Company
MultiplyShared: workspaceAntler 2021Not statedOther
BlitzIQShared: collaboration, productivity, workspaceYC W19InactiveOther
PatchworkShared: collaboration, productivity, slackYC W24InactiveAI
HackPadShared: collaboration, productivity, doneYC W12AcquiredOther
Sphere Secure WorkspaceShared: secure workspaceYC S15AcquiredOther

Also from S24 in AI

All of S24
AICodeVizOne living model of your software architectureYC S24San FranciscoStartup →AIHaystackReplay real customer journeys against every change before you shipYC S24New York CityStartup →AIInactivecamferBuilding the world’s first AI mechanical engineer.YC S24San FranciscoStartup →AICloudglueThe video context layer for AI.YC S24San FranciscoStartup →AIcmuxOpen source applied AI lab building next-gen devtoolsYC S24San FranciscoStartup →AIConductorRun a team of coding agents on your MacYC S24San FranciscoStartup →
Company
CodeVizOne living model of your software architectureteam of 2ActiveAI, Devtools
HaystackReplay real customer journeys against every change before you shipteam of 2ActiveAI, Devtools
camferBuilding the world’s first AI mechanical engineer.team of 4InactiveAI, Devtools
CloudglueThe video context layer for AI.team of 4hiringActiveAI, Devtools
cmuxOpen source applied AI lab building next-gen devtoolsteam of 3hiringActiveAI, Devtools
ConductorRun a team of coding agents on your Macteam of 8ActiveAI, Devtools

Founders

  • Christian DalSantoFounder/CEO

About Party

Party is the secure workspace for your team and agents to build together, in the open. Agent Flows handle 95% of the work and your team can see it all happen and step in when needed to steer. It's built for teams and collaboration first, but caters to the solo builder as well. Use any harness/model - your keys or ours. Cost observability. Memory. Dual-level session sandboxing. Slack/Teams are comm-first with agents as second-class citizens. Party is work-first and the communication happens where the work is being done. Party is for teams who want to build better and faster than their competition.

YC batch
S24 · Summer 2024
Status, per YC
Active
Category
AI, Developer tools
Team size
8
Location
San Francisco, CA, USA
Founded
2024
Checked
6h ago

YC tags: Developer Tools, Productivity, Collaboration, AI

Changes seen

TagsOct 19, 2026

No longer tagged Artificial Intelligence.

Source ↗
One-linerOct 8, 2026

Rewrote its one-liner; it read "Secure multiplayer software factory for your whole team in minutes"

Source ↗

Party in S24: 248 companies, 85% AI

LinkedIn

Party: questions

Which YC batch was Party in?

Party was in Y Combinator's Summer 2024 batch (S24).

Is Party still active?

Y Combinator lists Party as active.

Who founded Party?

Party's founders, as listed on its YC page: Christian DalSanto (Founder/CEO).

Where is Party based?

Party lists San Francisco, CA, USA as its location on YC's directory.